Cache boot classpath checksums at runtime init.

To speed up oat file checksums check.

Test: test.py
Bug: 191828947
(cherry picked from commit bbdb1ed109532f42949f84194e7717453f2f37f6)

Change-Id: I2e469793fccac543517a936dd764530ac1c1d2c7
Merged-In: I2fe97a5626220470ec3edf457a3a24e7d50ce6d7
3 files changed